Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

It discloses that the account is anonymous, no email/KYC, that a recovery_code is one-time and must be saved, that the mcp_token is used to reconnect the MCP server, and that the returned credential unlocks the full toolset. This goes well beyond the annotations (readOnlyHint=false, etc.) and tells the agent exactly what happens and what to do with the returned values.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single dense paragraph, front-loaded with the core purpose and returns, then a clear workflow. It is somewhat long but every sentence adds value. A 4 because it could be slightly tighter/crisper, but it is well structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given there is no output schema, the description compensates by enumerating every return value (account_id, api_key, api_secret, mcp_token, recovery_code) and their roles. It also explains the required next steps. For a bootstrap tool with no siblings and no output schema, this is complete enough for an agent to call it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3. The description adds the purpose of the returned credentials but not much about the two optional params beyond what the schema already says (label, idempotency_key). It does mention 'retried call' context, but the schema already covers idempotency. So baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description starts with a specific verb and resource: 'Create a brand-new ANONYMOUS Impreza account' and clearly states the one-call outcome. It distinguishes itself from what would come after (topup, VPS ordering) even though no siblings are listed.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly says when to use: 'when you have no account or token yet.' It also gives the next-step workflow: reconnect with mcp_token, then fund via impreza_topup before ordering a VPS. This is strong usage guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.